Kansas, Michigan, Colorado and California are some states that offer mobile libraries, or bookmobiles. The United States library system first used bookmobiles circa 1905, and as of 2015, approximately six percent of all United States libraries operate bookmobiles, with a rough grand total of 683 active bookmobiles.
Although library systems in most states offer bookmobiles, not all cities in every state have bookmobiles affiliated its local library system. Kansas has 39 library branches but operates 14 bookmobiles, including the Topeka and Shawnee County Library bookmobile. It has 20 scheduled stops throughout the city and county and runs six days per week.
Rochester Hills Public Library in Michigan operates two bookmobiles: a community bookmobile funded by the friends of the library and the Big Blue Bus funded by a donation from a private estate.
The Denver Public Library calls its bookmobile the Reading Rocket Bookmobile. There are two vehicles that serve elementary schools and senior living campuses.
In California, the San Francisco Public Library's bookmobiles form a mobile outreach team that operates Monday through Friday. The fleet includes the environmentally friendly Green Bookmobile, the Early Literacy Mobile, Library on Wheels for seniors, the Techmobile and the Treasure Island Bookmobile, which serves the Treasure Island community.